57145261 has 4 divisors (see below), whose sum is σ = 57304800. Its totient is φ = 56985724.

The previous prime is 57145259. The next prime is 57145337. The reversal of 57145261 is 16254175.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57145261 - 2¹ = 57145259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57145201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79231 + ... + 79948.

It is an arithmetic number, because the mean of its divisors is an integer number (14326200).

Almost surely, 2^57145261 is an apocalyptic number.

It is an amenable number.

57145261 is a deficient number, since it is larger than the sum of its proper divisors (159539).

57145261 is a wasteful number, since it uses less digits than its factorization.

57145261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159538.

The product of its digits is 8400, while the sum is 31.

The square root of 57145261 is about 7559.4484587171. The cubic root of 57145261 is about 385.1767581005.

The spelling of 57145261 in words is "fifty-seven million, one hundred forty-five thousand, two hundred sixty-one".